CN101057425A - Optical modulation method and system in wavelength locked FP-LD by injecting broadband light source using mutually injected FP-LD - Google Patents
Optical modulation method and system in wavelength locked FP-LD by injecting broadband light source using mutually injected FP-LD Download PDFInfo
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Abstract
The present invention relates to an optical modulation method and optical modulation system of a wavelength locked Fabry Perot-Laser Diode (FP-LD) by injecting a broadband light source (BLS) using mutual injection of FP-LDs. More specifically, the present invention relates to a novel modulation technology which embodies a wavelength locked FP-LD capable of being used as an economic light source in an optical network based on a wavelength-division multiplexing passive optical network (WDM-PON). According to the present invention, a light modulation system is suggested comprising: BLS being constructed by mutual injection between two FP-LDs and an optical fiber being used for light transmission; first AWG for filtering light from a plurality of oscillation modes of the BLS into n group; n FP-LDs outputting wavelength locked light which is divided through the first AWG; an encoder being provided at a transmitting end of a subscriber to which the output from the first AWG is transmitted; a circulator outputting light which is inputted through the first AWG; second AWG de-multiplexing WDM signals from the first AWG into n group; and a decoder being provided at a receiving end to which the output from the second AWG is transmitted. Therefore, the present invention makes it possible to provide a more economic light source for WDM-PON subscribers by embodying a wavelength locked FP-LD by injecting a low-cost BLS.
Description
Technical field
The present invention relates to a kind of optical modulation method and optical transmission system, it realizes the FP-LD of wavelength locking by the wideband light source (BLS) that injects the mutual injection of using fabry-Perot laser diode (FP-LD).In particular, the present invention relates to a kind of novel modulation, realized a kind of FP-LD of wavelength locking, the FP-LD of described wavelength locking can be as the light source based on the economy in the optic network of Wavelenght division multiplexing passive optical network (WDM-PON).
Background technology
In existing optic network, need the function expansion to provide various multimedia services, for example cumulative data traffic, HDTV (High-Definition Television) (HDTV), ecommerce and video request program (VOD) or the like.Based on this purpose, the research based on the optical fiber of PON technology is obtained extensive concern.Wavelength division multiplexing (WDM) technology in the current PON technology is considered to final substitute.In WDM technology, be necessary for each user and distribute a wavelength so that virtual point-to-point connectivity to be provided.Therefore, in the WDM-PON technology, realize that for the user low-cost light source is extremely important.
The FP-LD of wavelength locking is recently recommended and is considered to the economic light source of WDM-PON and (seen the inventor Chang-Hee of registration on February 28th, 2002, Lee and Hyun-Deok, the name of Kim is called the Korean Patent No.325687 of " A low-cost WDM source with an incoherent light injected Fabry-Perotsemiconductor laser diode ").Herein, the FP-LD of wavelength locking is by filtered incoherent light source or BLS being injected into the FP-LD of multimode oscillation and the oscillation wavelength of FP-LD being locked as the wavelength of BLS of injection so that a kind of light source that FP-LD obtains with the monotype vibration.
Herein, the BLS that is used for wavelength locking to be injected can be light-emitting diode (LED), the erbium-doped fiber amplifier (EDFA) of launching the spontaneous emission of amplification (ASE), superbright light-emitting diode (SLD) or the like.(seeing T.W.Oh, et al., " Broadband Light Source for Wavelength-Division Multiple Access Passive Optical " OECC, 2003).Yet the shortcoming of maximums such as LED, EDFA and SLD is that size is big or cost is high.Different with it is, the BLS that uses FP-LD to inject mutually is very compact and can realize with low cost, therefore when realizing economic WDM-PON, be more preferably and (see K.M.Choi, et al., " Broadband Light Source by MutuallyInjected FP-LDs " OECC, 2004).
Summary of the invention
A target of the present invention is to solve the prior art problem by FP-LD modulator approach and the optical transmission system that proposes a kind of novelty, and described FP-LD modulator approach and optical transmission system are by injecting the transmission quality that the BLS that uses FP-LD to inject mutually can improve wavelength locking FP-LD.
In order to realize above-mentioned target, the invention provides a kind of optic network, comprising: by injecting BLS that makes up and the optical fiber that is used for optical delivery between two FP-LD mutually; The one AWG (Waveguide array) is used for n the grouping that filter of the light from a plurality of oscillation modes of BLS; N FP-LD is by described AWG output wavelength locking light (wavelength locked light); At the encoder that user's transmitting terminal provides, wherein said transmitting terminal comprises FP-LD; Circulator, output is by the light of a described AWG and optical fiber input; The 2nd AWG will be separated into n grouping from the WDM signal multichannel of a described AWG; And the decoder that provides at receiving terminal, wherein said receiving terminal comprises the receiver (RX) of reception from the output of described the 2nd AWG.
Implementation result
According to the present invention, in the time will being injected into FP-LD 3 as user's laser based on the filtered BLS of specific wavelength, the characteristic of the FP-LD of wavelength locking can change with the temperature change of FP-LD shown in Figure 13.
As shown in figure 10, can realize free-error transmission, although the power loss of about 2.5dB takes place when measuring the signal that BER transmits under with the best of analyzing the wavelength locking FP-LD 3 that obtains in experimental configuration as shown in Figure 6 and the poorest performance situation.
That is to say, come the FP-LD of any wavelength locking that modulation signal realizes to be suitable for by modulation format, the noise of the BLS that the use FP-LD that described modulation format can be avoided injecting injects mutually as user's light source and no matter how ambient temperature changes with the electric frequency spectrum (electrical spectrum) in certain zone.
Description of drawings
Fig. 1 has shown the structure chart that injects the wavelength locking FP-LD that uses the mutual BLS that injects of FP-LD according to an embodiment of the invention;
Fig. 2 has shown the spectrum that uses the mutual BLS that injects of FP-LD;
Fig. 3 has shown mutual BLS that injects of use FP-LD and the noise characteristic of wavelength locking FP-LD;
Fig. 4 has shown the error rate (BER) characteristic of the wavelength locking FP-LD that realizes by structure as shown in Figure 1;
Fig. 5 has shown the electric frequency spectrum of modulation format;
Fig. 6 has shown according to an embodiment of the invention by injecting the use FP-LD structure chart of the modulator approach of the wavelength locking FP-LD of the BLS of injection mutually;
Fig. 7 has shown the structure chart based on the WDM-PON of Fig. 6;
Fig. 8 has shown the frequency spectrum of BLS after the filtering, and the Manchester data of using in experiment, and as the NRZ of modulation format;
Fig. 9 has shown the variation that ends along with the BPF medium and low frequency, the reception susceptibility of wavelength locking FP-LD;
Figure 10 has shown the best and the poorest BER when transmission NRZ and Manchester data;
Figure 11 shown when transmission NRZ and Manchester data, depend on inject the optimum BER of the power of BLS; And
Figure 12 has shown the structure chart based on bidirectional WDM-PON of Fig. 6.
Embodiment
Describe according to a preferred embodiment of the invention 26S Proteasome Structure and Function more in detail below with reference to accompanying drawing.
In the present invention, having as shown in phantom in Figure 1, the BLS of structure is injected into to realize wavelength locking FP-LD.The BLS that is injected is to use two FP-LD, and (FP-LD1, the light source that the mutual injecting principle between FP-LD2) is realized have antireflection (AR) at the front end face of described FP-LD and apply.The live width of single FP-LD is widened to about 0.2nm before injecting mutually after injecting mutually.And BLS shown in Figure 1 has following characteristic, and promptly the mode partition noise in FP-LD pattern is lowered.The spectrum that uses the BLS that FP-LD injects mutually as shown in Figure 2, and noise characteristic is as shown in Figure 3.Fig. 2 and Fig. 3 have confirmed that live width is broadened and noise is lowered.
Use as shown in Figure 1 structure to be used to by injecting the FP-LD that BLS realizes wavelength locking, described BLS is that the mutual injection by FP- LD 1,2 realizes.The power output of BLS is filtered into the FP-LD3 with multimode oscillation that required wavelength and filtered power output are injected into the user side.In order to hold more users, FP-LD can be connected to the output port of AWG 1., use the power of a fiber amplifier (EDFA) herein, use polarization controller (PC) simultaneously to regulate the polarization of BLS along with the polarization of user side's FP-LD 3 with compensation BLS.To this, when ambient temperature changes,, the optical maser wavelength of FP-LD3 depends on temperature thereby being changed the performance of the FP-LD of wavelength locking.Therefore, a target of the present invention is to realize a kind of user's light source that is independent of temperature change, and this is a key factor as wavelength division multiplexing (WDM) light source.
Fig. 4 has shown at the wavelength locking FP-LD 3 that realizes by a pattern injecting FP-LD 1, the 2 mutual BLS that inject under the situation modulated by the NRZ data of using 100Mb/s, depended on bit error rate (BER) (BER) characteristic that temperature is measured under best and worst condition.If Fig. 4 has shown when the transmission characteristic of the light source of implementing descends that can not obtain free-error transmission, these are different with optimal cases under worst condition.This noise contribution that is relative intensity noise (RIN) the frequency spectrum medium and low frequency zone owing to the pattern of as shown in Figure 3 BLS that inject mutually at FP- LD 1,2 exists causes.Therefore, the present invention proposes the method for the wavelength locking FP-LD of a kind of FP-LD of use 1,2 mutual BLS that inject as user side's the light source that is independent of temperature change.Based on this purpose, the performance of the light of transmission can improve by the following method, and the noise effect that exists in the low frequency region of this method with the pattern of filtered and the BLS that is injected into minimizes.
As shown in Figure 3, inject a filtered pattern of BLS that realizes mutually by FP- LD 1,2 and have the strong noise composition at low frequency region.Therefore, the wavelength-locked light source that has the BLS realization of noise characteristic as mentioned above by injection also has identical noise contribution, as shown in Figure 3.If performance the best of wavelength-locked light source, then noise characteristic demonstrates the form identical with the noise characteristic of injecting BLS, and the noise of the BLS that injects is lowered.On the contrary, if the performance of wavelength-locked light source is the poorest, Fig. 3 has shown and the opposite increase of noise suppression effect and noise do not occurred.The present invention is used following principle, promptly carrying out the signal modulation to improve when injecting FP- LD 1,2 and inject the transmission performance of the wavelength locking FP-LD that the BLS that realize realize mutually, even do not comprise noise contribution in low frequency region, noise characteristic still is enhanced.
If the modulated transmission signal in the mode that does not have electric spectrum component in the modulator approach shown in Figure 5 in low frequency part, then Chuan Shu signal can have the low-frequency noise composition of BLS and the signal spectrum (signal spectrum) after the modulation.Receiver side receives low-frequency noise composition with BLS and the transmission signals of modulating the back signal spectrum, and only passes through the signal spectrum composition after the modulation, thereby removes the low-frequency noise composition of BLS.In the case, if passed through the major part of modulation back signal spectrum composition, then can receive transmission signals and without any distortion.By using the noise in the said method removal low-frequency component, can improve because the transmission quality that the low-frequency noise composition causes reduces.
The 50Mb/s that the present invention is based on the Manchester form in the various modulation format shown in Figure 5 modulates the result who produces and has described this structure and operation principle thereof.Structure of the present invention is shown among Fig. 6, has wherein shown the experimental configuration of wavelength locking FP-LD light source.
In Fig. 6, the BLS that uses among the present invention is for utilizing the BLS of the mutual injecting principle between the FP- LD 1,2, and wherein each has the AR coating at its front end face among the FP-LD 1,2.The light energy of BLS is being amplified by EDFA afterwards by PC (polarization controller), and transmit by optical fiber (20Km) then and enter an AWG, the one AWG carries out filtering and it is divided into n grouping the light of transmission, and wherein n is the output port number of an AWG or the passage number of WDM signal.The BLS output of a division is injected into FP-LD 3, the light source of FP-LD 3 output wavelengths locking.
In the present invention, the temperature of FP-LD is by heater and TEC control, and user side's FP-LD 3 transmits data after using the Manchester coding modulation data.The modulation format that uses in the experiment is encoded from the NRZ signal as Manchester form, this form, and has shown the electric frequency spectrum of each measurement in Fig. 8.
Preferably, can be applied to modulation format of the present invention be bipolar (bi-polar), make zero (conversion of alternation mark) (RZ (RZ-AMI)), Difference Manchester (difference Manchester), bipolarity 8 zero are replaced (B8ZS), High Density Bipolar 3 (HDB3) and pseudo ternaries (pseudoternary) or the like.If data are not by having forms such as the Manchester coding modulation of electric composition (electrical component) in low frequency region as shown in Figure 8, then the low-frequency noise composition of the BLS of Zhu Ruing can not influence the data of transmission.
Data are by an AWG and circulator (it places between optical fiber and the EDFA) and be transferred to receiving terminal after the 2nd AWG that is provided with by central process chamber after the above-mentioned modulation.The noise that the data of transmission exist in photodiode (Rx 1) experience opto-electronic conversion and the low frequency region in data passes through band pass filter (BPF) by filtering.Filtered data are original NRZ data by decoder from the Manchester formats.
In the present invention, the performance of the signal that receives is affected according to the low-frequency cutoff among the BPF, and Fig. 9 has shown acquisition 10
-9The sensitivity of BER.Optimum low-frequency cutoff is determined by Fig. 9, and the BER characteristic that obtains when the optimum low-frequency cutoff of determining is applied to the BPF of the receiving terminal in the central process chamber is enhanced as shown in figure 10.That is to say, even under the poorest situation of the BER characteristic of the 50Mb/sManchester of the FP-LD that is appreciated that in wavelength locking, also can carry out free-error transmission.And-21dBm or more BLS power need be injected in optimal cases to obtain free-error transmission.By Figure 11 as seen, this means that but required injecting power compares low 3dB with injecting power required when using with receiver same band as shown in Figure 7 when not having the receiver of BPF and transmission 100Mb/s NRZ data.
When above-mentioned principle being applied to a plurality of FP-LD of user side, can realize the WDM-PON system.In the case, BLS must have the non-polarized output by using two PC and a polarization optical splitter (PBS) to obtain.With reference to the structure chart among the figure 7, the multiplexed BLS of polarization that transmits by optical fiber (20Km) is divided into n grouping by an AWG who the various oscillation modes of BLS is carried out filtering, wherein n is the output port number of an AWG or the passage number of WDM signal, and be injected into n FP-LD then, the light of each FP-LD output wavelength locking.
N FP-LD the user side is the Manchester coded format with data-modulated.Data after the above-mentioned modulation are by an AWG, Transmission Fibers, circulator (output is by the light of an AWG and optical fiber input) and be transferred to receiving terminal after by the 2nd AWG that WDM signal multichannel is separated into n grouping in the central process chamber.By this method, can obtain the transmission of free from error signal and the influence that not changed by ambient temperature.Herein, each laser of user is FP-LD just only, thus all users can use same type laser and no matter how inject wavelength.That is to say, can be independent of wavelength and realize subscriber equipment.
As mentioned above, the invention describes the upstream situation that the user transfers data to central process chamber.Yet the method that the present invention proposes can be applied to the downstream scenario that central process chamber transfers data to the user.In the case, BLS and FP-LD all are arranged in central process chamber.The experimental configuration that is applied to the two-way communication between central process chamber and the user as shown in figure 12.In Figure 12, BLS is present in central process chamber one side, and reflector and receiver be built as an assembled unit, and wherein input and output signal is divided by the WDM filter and transmits.
The light sources such as FP-LD of for example wavelength locking that realizes by the BLS that inject to use FP-LD to inject mutually can be applied to the general light source of optical communication according to the preferred embodiment of the invention, wherein have 1/f noise in low frequency region.That is to say, by injection luminescent diode (LED), amplify spontaneous emission (ASE) diode and superbright light-emitting diode, 1/f noise still is present in the low frequency region of wavelength locking FP-LD, thereby the influence that therefore can bring by the modulator approach reduction 1/f noise that proposes among application the present invention improves the performance of modulation signal.
Industrial usability
According to the present invention, when being injected into user's laser instrument based on the filtered BLS of wavelengths characteristic, ripple The characteristic of the laser instrument of long locking can change along with the temperature change of laser instrument.
According to the present invention, can carry out free-error transmission, although measuring BER to analyze in wavelength locking The power attenuation of about 2.5dB takes place during the signal that transmits in the best of FP-LD 3 and the poorest performance situation. That is to say that modulation format with the electric frequency spectrum in the certain area realizes by signal is modulated to The FP-LD of any wavelength locking is suitable for as user's light source and how changes institute regardless of environment temperature State modulation format and can avoid using the mutually noise of the injection BLS of injection of FP-LD.
Claims (22)
1. a use has the light modulating method in the optical communication system of light source of 1/f noise in low frequency region, comprising: the modulation format that light modulation is not had signal spectrum in for the zone that has 1/f noise in Transmitter side; And remove 1/f noise and do not influence transmission signals, thereby improve the performance of described optical communication system the recipient.
2. light modulating method according to claim 1, the wherein said light source that has 1/f noise in low frequency region is the wavelength locking fabry-Perot laser diode by realizing from outside injection wideband light source.
3. light modulating method according to claim 2, the fabry-Perot laser diode of wherein said wavelength locking has antireflection coated.
4. light modulating method according to claim 2, the wideband light source of the wherein said wideband light source that injects from the outside for using fabry-Perot laser diode to inject mutually.
5. light modulating method according to claim 2, the wherein said wideband light source that injects from the outside be from comprise light-emitting diode, amplify that the group of spontaneous emitting diode and superbright light-emitting diode selects one.
6. light modulating method according to claim 4, employed each fabry-Perot laser diode of wideband light source that wherein said use fabry-Perot laser diode injects mutually has antireflection coated.
7. light modulating method according to claim 4, the wideband light source that wherein said use fabry-Perot laser diode injects mutually improves bandwidth by using the very wide broadband fabry-Perot laser diode of gain bandwidth.
8. light modulating method according to claim 4, wherein said light modulating method utilizes the modulation format that does not have electric composition in low frequency region when the Transmitter side modulation signal, for example bipolar, make zero (conversion of alternation mark), Manchester, Difference Manchester, bipolarity 8 zero is replaced High Density Bipolar 3 and pseudo ternary or the like.
9. according to claim 1 or 4 described light modulating methods, wherein said light modulating method is removed 1/f noise and is not influenced transmission signals the recipient by using band pass filter.
10. optic network comprises:
By injecting wideband light source that makes up and the optical fiber that is used for optical delivery between two fabry-Perot laser diodes mutually;
First Waveguide array, being used for the light from a plurality of oscillation modes of broadband light source filtered is n grouping;
N fabry-Perot laser diode, the output wavelength locking light by described first Waveguide array;
At the encoder that user's transmitting terminal provides, wherein said transmitting terminal comprises fabry-Perot laser diode;
Circulator, output is by the light of described first Waveguide array and optical fiber input;
Second Waveguide array will be separated into n grouping from the wavelength-division multiplex signals multichannel of described first Waveguide array; And
At the decoder that receiving terminal provides, wherein said receiving terminal comprises that receiver is used to receive the output from described second Waveguide array.
11. optic network according to claim 10, thereby wherein said optic network further comprises the erbium-doped fiber amplifier that is connected the through-put power that provides enough between described wideband light source and the described circulator.
12. optic network according to claim 10, wherein said optic network further comprises polarization controller, this polarization controller is connected between described wideband light source and the described circulator, thereby regulates the polarization of described wideband light source along with the polarization of the fabry-Perot laser diode of output wavelength locking light.
13. optic network according to claim 10, a wherein said n fabry-Perot laser diode has antireflection coated respectively.
14. optic network according to claim 10, the temperature of a wherein said n fabry-Perot laser diode is controlled by heater and TEC.
15. optic network according to claim 10, a wherein said n fabry-Perot laser diode is modulated to the characteristic with wavelength locking fabry-Perot laser diode by the wideband light source that injects from the outside.
16. optic network according to claim 10, the decoder utilization of the encoder of wherein said transmitting terminal and receiving terminal does not have the modulation format of electric composition in low frequency region, for example bipolar, (conversion of alternation mark), Manchester, Difference Manchester, bipolarity 8 zero replacements, High Density Bipolar 3 and pseudo ternary or the like make zero.
17. optic network according to claim 10, wherein said optic network further comprises band pass filter, is used for blocking low-frequency component at receiving terminal, and described receiving terminal comprises that receiver is to receive the output from described second Waveguide array.
18. optic network according to claim 10, wherein said optic network are used as the optical delivery equipment of two-way communication.
19. optic network according to claim 10, the light of the different-waveband of wherein said wideband light source is injected central process chamber and user side respectively.
20. optic network according to claim 10, wherein by in n the fabry-Perot laser diode of described first Waveguide array output wavelength locking light each, comprise encoder, the band pass filter of transmitting terminal and comprise that the decoder of receiving terminal is combined into a unit.
21. optic network according to claim 10, wherein said band pass filter, comprise receiver with in n the fabry-Perot laser diode that provide and the decoder that comprise described receiving terminal of receiving terminal from the output of described second Waveguide array, output wavelength locking light are provided each and comprise that the encoder of transmitting terminal is combined into a unit.
22. according to claim 20 or 21 described optic networks, the input of wherein said receiving terminal and after dividing, be transmitted by wave-division multiplexer filter from the output of described transmitting terminal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040091078 | 2004-11-09 | ||
| KR10-2004-0091078 | 2004-11-09 | ||
| KR1020040091078A KR100680815B1 (en) | 2004-11-09 | 2004-11-09 | Optical modulation method and system in wavelength locked FP-LD by injecting broadband light source using mutually injected FP-LD |
| PCT/KR2005/003767 WO2006052075A1 (en) | 2004-11-09 | 2005-11-08 | Optical modulation method and system in wavelength locked fp-ld by injecting broadband light source using mutually injected fp-ld |
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| CN101057425A true CN101057425A (en) | 2007-10-17 |
| CN101057425B CN101057425B (en) | 2015-07-01 |
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| US (1) | US8073334B2 (en) |
| EP (1) | EP1810426B1 (en) |
| JP (1) | JP4773454B2 (en) |
| KR (1) | KR100680815B1 (en) |
| CN (1) | CN101057425B (en) |
| WO (1) | WO2006052075A1 (en) |
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| WO2012003809A1 (en) * | 2010-07-09 | 2012-01-12 | Huawei Technologies Co., Ltd. | Use of Multiple Shared Wavelength Lockers to Stabilize Transuponders in a Wavelength Division Multiplexing (WDM) Network |
| CN102449937A (en) * | 2009-04-30 | 2012-05-09 | 韩国科学技术院 | Light source for a wavelength division multiplexed optical communications capable of the high-speed transmission of an optical signal using an unpolarized light source, and wavelength division multiplexing passive optical network comprising same |
| CN101695200B (en) * | 2009-10-28 | 2012-06-13 | 于晋龙 | Optical RF up-converter system for realizing tuned frequency on basis of injecting signal light in FP-LD |
| CN102625980A (en) * | 2009-05-20 | 2012-08-01 | 爱立信股份有限公司 | Method and system for bidirectional optical communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100325687B1 (en) | 1999-12-21 | 2002-02-25 | 윤덕용 | A low-cost WDM source with an incoherent light injected Fabry-Perot semiconductor laser diode |
| KR100955129B1 (en) | 2003-05-30 | 2010-04-28 | 정보통신연구진흥원 | wavelength-division multiple access passive optical network using the incoherent broadband light source |
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- 2005-11-08 CN CN200580038051.2A patent/CN101057425B/en not_active Expired - Fee Related
- 2005-11-08 US US11/665,902 patent/US8073334B2/en not_active Expired - Fee Related
- 2005-11-08 WO PCT/KR2005/003767 patent/WO2006052075A1/en active Application Filing
- 2005-11-08 EP EP05820436.3A patent/EP1810426B1/en not_active Not-in-force
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| CN102449937A (en) * | 2009-04-30 | 2012-05-09 | 韩国科学技术院 | Light source for a wavelength division multiplexed optical communications capable of the high-speed transmission of an optical signal using an unpolarized light source, and wavelength division multiplexing passive optical network comprising same |
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| WO2012003809A1 (en) * | 2010-07-09 | 2012-01-12 | Huawei Technologies Co., Ltd. | Use of Multiple Shared Wavelength Lockers to Stabilize Transuponders in a Wavelength Division Multiplexing (WDM) Network |
| CN102986154A (en) * | 2010-07-09 | 2013-03-20 | 华为技术有限公司 | Use of multiple shared wavelength lockers to stabilize transuponders in a wavelength division multiplexing (WDM) network |
| US8781327B2 (en) | 2010-07-09 | 2014-07-15 | Futurewei Technologies, Inc. | Use of multiple shared wavelength lockers to stabilize transponders in a wavelength division multiplexing (WDM) network |
| CN102986154B (en) * | 2010-07-09 | 2016-06-22 | 华为技术有限公司 | Wave division multiplexing (WDM) network use multiple sharing wavelength lock to stablize transponder |
Also Published As
| Publication number | Publication date |
|---|---|
| US20090196612A1 (en) | 2009-08-06 |
| EP1810426A4 (en) | 2010-01-13 |
| JP2008520124A (en) | 2008-06-12 |
| EP1810426B1 (en) | 2013-05-29 |
| KR100680815B1 (en) | 2007-02-08 |
| EP1810426A1 (en) | 2007-07-25 |
| US8073334B2 (en) | 2011-12-06 |
| JP4773454B2 (en) | 2011-09-14 |
| KR20060042486A (en) | 2006-05-15 |
| WO2006052075A1 (en) | 2006-05-18 |
| CN101057425B (en) | 2015-07-01 |
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